FOUNDATION FAN MOUNTING LOCATION
Mount Crawl Space Ventilator inside the crawl space behind existing foundation ventilation openings. Ventilation openings shall be within three feet of each corner of the building.
NOTE: Crawl Space Ventilator must be mounted with the electrical control box and the motor facing the interior of the crawl space.
1. Remove existing doors or covers on ventilation openings around the perimeter of the building.
2. Position the Crawl Space Ventilator over the ventilation opening.
3. If installing on foundation block or brick, mark location in the four corners of the metal face plate and drill 5/16" holes with masonry bit. Install wall anchors into openings and secure Crawl Space Ventilator to the wall with four screws.
If installing on a wood header, rim joist or mesh on existing crawl space vent, secure Crawl Space Ventilator with screws, washers and nuts in the four corners of the Ventilator metal face plate.
How to determine the number of UnderAire™ Ventilators needed:
Calculate the cubic area of the crawl space by multiplying the length x width x height. Divide this number by 15 to determine the minimum CFM necessary to fully ventilate the space in 15 minutes.
Example: 20' wide x 40' long x 3' high crawl space = 2,400 cubic ft.
2400 cubic ft. ÷ 15 minutes = 160 CFM of ventilation.
Choose two V1 or V1D ventilators or one V2D ventilator.
UnderAire™ Foundation Vent
The UnderAire™ crawl space vents can be used to provide foundations with passive ventilation or can be used along with a fan-powered crawl space ventilator for maximum effectiveness.
These units not only provide ventilation during the warmer months, but also include a winter guard which allows homeowners to fully seal the crawl space during the heating season--greatly improving the home's energy efficiency.
Tjernlund UnderAire™ crawl space vents can be completely installed from the outside of the crawl space in minutes.
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